High efficiency is the term given to condensing boilers which, thanks to their modern heat-exchange technology, efficiently recover high levels of heat energy from waste flue gases and recycle it back into your heating system. Condensing boilers are so efficient that they can convert around 90% of your boiler’s waste gases into usable heating.
High efficiency condensing boilers have superseded older-style conventional boilers which are non-condensing and are only considered ‘standard efficiency’. This is because they release a lot of waste gases into the atmosphere and only recover around 60-70% of the heat energy making them less efficient and more damaging for the environment. In fact, as a result of this, there have been changes in the law and it is now mandatory for all new boilers in domestic homes to be high efficiency condensing models.